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href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">网络编程代码实例：传输控制协议（TCP）简单版</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-04-24T12:49:44.000Z" title="发表于 2023-04-24 20:49:44">2023-04-24</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-05-22T02:51:29.262Z" title="更新于 2023-05-22 10:51:29">2023-05-22</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E7%8E%AF%E5%A2%83%E5%92%8C%E7%BD%91%E7%BB%9C%E7%BC%96%E7%A8%8B/">环境和网络编程</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="网络编程代码实例：传输控制协议（TCP）简单版"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>网络编程代码实例：传输控制协议（TCP）简单版。</p>
<hr>
<h1 id="代码仓库"><a href="#代码仓库" class="headerlink" title="代码仓库"></a>代码仓库</h1><ul>
<li><a target="_blank" rel="noopener" href="https://github.com/yezhening/Environment-and-network-programming-examples">yezhening&#x2F;Environment-and-network-programming-examples: 环境和网络编程实例 (github.com)</a></li>
<li><a target="_blank" rel="noopener" href="https://gitee.com/yezhening/Environment-and-network-programming-examples">Environment-and-network-programming-examples: 环境和网络编程实例 (gitee.com)</a></li>
</ul>
<hr>
<h1 id="内容"><a href="#内容" class="headerlink" title="内容"></a>内容</h1><ul>
<li>使用传输控制协议（TCP）</li>
<li>一个服务端连接一个客户端</li>
<li>一次自动通信</li>
</ul>
<hr>
<h1 id="代码（有详细注释）"><a href="#代码（有详细注释）" class="headerlink" title="代码（有详细注释）"></a>代码（有详细注释）</h1><h2 id="server-c"><a href="#server-c" class="headerlink" title="server.c"></a>server.c</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 头文件————————————————————</span></span><br><span class="line"><span class="comment">// #include &lt;sys/socket.h&gt; // socket()、sockaddr、bind()、listen()、accept()、recv()、send()</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span>      <span class="comment">//(perror())、printf()</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span>     <span class="comment">//exit()</span></span></span><br><span class="line"><span class="comment">// #include &lt;netinet/in.h&gt; //sockaddr_in、（htons()）</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;string.h&gt;</span>     <span class="comment">//bzero()、strncpy()</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;arpa/inet.h&gt;</span>  <span class="comment">//inet_pton()</span></span></span><br><span class="line"><span class="comment">// #include &lt;unistd.h&gt;     //close()</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 全局常量————————————————————</span></span><br><span class="line"><span class="type">const</span> g_serv_port = <span class="number">3333</span>;     <span class="comment">// 服务端的端口号</span></span><br><span class="line"><span class="type">const</span> g_listen_max_count = <span class="number">1</span>; <span class="comment">// 监听的最大连接数</span></span><br><span class="line"><span class="type">const</span> g_buff_size = <span class="number">16</span>;       <span class="comment">// 消息缓冲区的大小</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 主函数————————————————————</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> arg, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">// 网络连接————————————————————</span></span><br><span class="line">    <span class="type">int</span> listen_fd; <span class="comment">// 监听套接字文件描述符</span></span><br><span class="line">    <span class="comment">// 创建套接字并获取套接字文件描述符</span></span><br><span class="line">    <span class="keyword">if</span> ((listen_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;socket() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">serv_addr</span>;</span> <span class="comment">// 服务端网络信息结构体</span></span><br><span class="line">    <span class="comment">// 初始化服务端网络信息结构体</span></span><br><span class="line">    bzero(&amp;serv_addr, <span class="keyword">sizeof</span>(serv_addr));</span><br><span class="line">    serv_addr.sin_family = AF_INET;</span><br><span class="line">    serv_addr.sin_port = htons(g_serv_port);</span><br><span class="line">    <span class="keyword">if</span> ((inet_pton(AF_INET, <span class="string">&quot;0.0.0.0&quot;</span>, &amp;serv_addr.sin_addr)) != <span class="number">1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;inet_pton() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 绑定套接字与网络信息</span></span><br><span class="line">    <span class="keyword">if</span> ((bind(listen_fd, (<span class="keyword">struct</span> sockaddr *)(&amp;serv_addr), <span class="keyword">sizeof</span>(serv_addr))) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(listen_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;bind() close() error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;bind() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 套接字设置被动监听状态</span></span><br><span class="line">    <span class="keyword">if</span> ((listen(listen_fd, g_listen_max_count)) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(listen_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;listen() close() error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;listen() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">clie_addr</span>;</span> <span class="comment">// 客户端网络信息结构体</span></span><br><span class="line">    <span class="type">int</span> clie_addr_size;           <span class="comment">// 客户端网络信息结构体大小</span></span><br><span class="line">    <span class="type">int</span> connect_fd;               <span class="comment">// 连接套接字文件描述符</span></span><br><span class="line">    bzero(&amp;clie_addr, <span class="keyword">sizeof</span>(clie_addr));</span><br><span class="line">    clie_addr_size = <span class="keyword">sizeof</span>(<span class="keyword">struct</span> sockaddr);</span><br><span class="line">    <span class="comment">// 与客户端建立连接</span></span><br><span class="line">    <span class="keyword">if</span> ((connect_fd = accept(listen_fd, (<span class="keyword">struct</span> sockaddr *)(&amp;clie_addr), &amp;clie_addr_size)) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(listen_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;accept() error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;accept() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 传输数据————————————————————</span></span><br><span class="line">    <span class="type">char</span> msg_recv[g_buff_size]; <span class="comment">// 从客户端接收的消息缓冲区</span></span><br><span class="line">    <span class="type">char</span> msg_send[g_buff_size]; <span class="comment">// 发送到客户端的消息缓冲区</span></span><br><span class="line">    bzero(&amp;msg_recv, <span class="keyword">sizeof</span>(*msg_recv));</span><br><span class="line">    bzero(&amp;msg_send, <span class="keyword">sizeof</span>(*msg_send));</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> ((recv(connect_fd, msg_recv, g_buff_size, <span class="number">0</span>)) == <span class="number">-1</span>) <span class="comment">// 接收数据</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(connect_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;recv() close() connect_fd error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> ((close(listen_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;recv() close() listen_fd error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;recv() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;%s\n&quot;</span>, msg_recv); <span class="comment">// 接收的消息</span></span><br><span class="line"></span><br><span class="line">    <span class="built_in">strncpy</span>(msg_send, msg_recv, g_buff_size);               <span class="comment">// 发送的消息</span></span><br><span class="line">    <span class="keyword">if</span> ((send(connect_fd, msg_send, g_buff_size, <span class="number">0</span>)) == <span class="number">-1</span>) <span class="comment">// 发送数据</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(connect_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;send() close() connect_fd error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> ((close(listen_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;send() close() listen_fd error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;send() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 关闭套接字文件描述符</span></span><br><span class="line">    <span class="keyword">if</span> ((close(connect_fd)) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;close() connect_fd error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> ((close(listen_fd)) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;close() listen_fd error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>


<hr>
<h2 id="client-c"><a href="#client-c" class="headerlink" title="client.c"></a>client.c</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 头文件————————————————————</span></span><br><span class="line"><span class="comment">// #include &lt;sys/socket.h&gt; //socket()、sockaddr、connect()、send()、recv()</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span>  <span class="comment">//（perror()）、printf()</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span> <span class="comment">//exit()</span></span></span><br><span class="line"><span class="comment">// #include &lt;netinet/in.h&gt; //sockaddr_in、（htons()）</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;string.h&gt;</span>    <span class="comment">//bzero()、strncpy()</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;arpa/inet.h&gt;</span> <span class="comment">//inet_pton()</span></span></span><br><span class="line"><span class="comment">// #include &lt;unistd.h&gt;     //close()</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 全局常量————————————————————</span></span><br><span class="line"><span class="type">const</span> g_serv_port = <span class="number">3333</span>; <span class="comment">// 服务端端口号</span></span><br><span class="line"><span class="type">const</span> g_buff_size = <span class="number">16</span>;   <span class="comment">// 消息缓冲区大小</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 主函数————————————————————</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">// 网络连接————————————————————</span></span><br><span class="line">    <span class="type">int</span> sock_fd; <span class="comment">// 套接字文件描述符</span></span><br><span class="line">    <span class="comment">// 创建套接字并获取套接字文件描述符</span></span><br><span class="line">    <span class="keyword">if</span> ((sock_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;socket() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">serv_addr</span>;</span> <span class="comment">// 服务端网络信息结构体</span></span><br><span class="line">    <span class="comment">// 初始化服务端网络信息结构体</span></span><br><span class="line">    bzero(&amp;serv_addr, <span class="keyword">sizeof</span>(serv_addr));</span><br><span class="line">    serv_addr.sin_family = AF_INET;</span><br><span class="line">    serv_addr.sin_port = htons(g_serv_port);</span><br><span class="line">    <span class="keyword">if</span> ((inet_pton(AF_INET, <span class="string">&quot;127.0.0.1&quot;</span>, &amp;serv_addr.sin_addr)) != <span class="number">1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;inet_pton() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 与服务端建立连接</span></span><br><span class="line">    <span class="keyword">if</span> ((connect(sock_fd, (<span class="keyword">struct</span> sockaddr *)(&amp;serv_addr), <span class="keyword">sizeof</span>(serv_addr))) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(sock_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;connect() close() error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;connect() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 数据传输</span></span><br><span class="line">    <span class="type">char</span> msg_send[g_buff_size]; <span class="comment">// 发送到服务端的消息缓冲区</span></span><br><span class="line">    <span class="type">char</span> msg_recv[g_buff_size]; <span class="comment">// 从服务端接收的消息缓冲区</span></span><br><span class="line">    bzero(&amp;msg_recv, <span class="keyword">sizeof</span>(*msg_recv));</span><br><span class="line">    bzero(&amp;msg_send, <span class="keyword">sizeof</span>(*msg_send));</span><br><span class="line"></span><br><span class="line">    <span class="built_in">strncpy</span>(msg_send, <span class="string">&quot;Hello&quot;</span>, <span class="number">6</span>);                       <span class="comment">// 发送的消息</span></span><br><span class="line">    <span class="keyword">if</span> ((send(sock_fd, msg_send, g_buff_size, <span class="number">0</span>)) == <span class="number">-1</span>) <span class="comment">// 发送数据</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(sock_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;send() close() error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;send() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> ((recv(sock_fd, msg_recv, g_buff_size, <span class="number">0</span>)) == <span class="number">-1</span>) <span class="comment">// 接收数据</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((close(sock_fd)) == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;recv() close() error&quot;</span>);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        perror(<span class="string">&quot;recv() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;%s\n&quot;</span>, msg_recv); <span class="comment">// 接收的消息</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 关闭套接字文件描述符</span></span><br><span class="line">    <span class="keyword">if</span> ((close(sock_fd)) == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;close() error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<hr>
<h2 id="Makefile"><a href="#Makefile" class="headerlink" title="Makefile"></a>Makefile</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#变量</span></span><br><span class="line">targets = server client</span><br><span class="line"></span><br><span class="line"><span class="comment">#伪目标</span></span><br><span class="line">.PHONY : all</span><br><span class="line">all : $(targets) </span><br><span class="line"></span><br><span class="line"><span class="comment">#规则</span></span><br><span class="line">server : server.c</span><br><span class="line">	gcc -o server server.c </span><br><span class="line"></span><br><span class="line">client : client.c</span><br><span class="line">	gcc -o client client.c</span><br><span class="line"></span><br><span class="line"><span class="comment">#伪目标</span></span><br><span class="line">.PHONY : clean</span><br><span class="line">clean :</span><br><span class="line">	<span class="built_in">rm</span> $(targets)</span><br></pre></td></tr></table></figure>
<hr>
<h1 id="结果"><a href="#结果" class="headerlink" title="结果"></a>结果</h1><p>server：</p>
<p><img src= "" data-lazy-src="/../img/simple_tcp/one.png" alt="在这里插入图片描述"></p>
<p>client：</p>
<p><img src= "" data-lazy-src="/../img/simple_tcp/two.png" alt="在这里插入图片描述"></p>
<hr>
<h1 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h1><p>网络编程代码实例：传输控制协议（TCP）简单版。</p>
<hr>
<h1 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h1><ul>
<li>《UNIX环境高级编程（第3版）》作者：W.Richard Stevens，Stephen A.Rago</li>
<li>《UNIX网络编程（第3版）》作者：W.Richard Stevens，Bill Fenner，Andrew M.Rudoff</li>
</ul>
<hr>
<h1 id="作者的话"><a href="#作者的话" class="headerlink" title="作者的话"></a>作者的话</h1><ul>
<li><strong>感谢参考资料的作者&#x2F;博主</strong></li>
<li>作者：夜悊</li>
<li>版权所有，转载请注明出处，谢谢~</li>
<li><strong>如果文章对你有帮助，请点个赞或加个粉丝吧，你的支持就是作者的动力~</strong></li>
<li>文章在描述时有疑惑的地方，请留言，定会一一耐心讨论、解答</li>
<li>文章在认识上有错误的地方, 敬请批评指正</li>
<li>望读者们都能有所收获</li>
</ul>
<hr>
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class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content is-expand"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%89%8D%E8%A8%80"><span class="toc-number">1.</span> <span class="toc-text">前言</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E4%BB%A3%E7%A0%81%E4%BB%93%E5%BA%93"><span class="toc-number">2.</span> <span class="toc-text">代码仓库</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%86%85%E5%AE%B9"><span class="toc-number">3.</span> <span class="toc-text">内容</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E4%BB%A3%E7%A0%81%EF%BC%88%E6%9C%89%E8%AF%A6%E7%BB%86%E6%B3%A8%E9%87%8A%EF%BC%89"><span class="toc-number">4.</span> <span class="toc-text">代码（有详细注释）</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#server-c"><span class="toc-number">4.1.</span> <span class="toc-text">server.c</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#client-c"><span class="toc-number">4.2.</span> <span class="toc-text">client.c</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Makefile"><span class="toc-number">4.3.</span> <span class="toc-text">Makefile</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E7%BB%93%E6%9E%9C"><span class="toc-number">5.</span> <span class="toc-text">结果</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E6%80%BB%E7%BB%93"><span class="toc-number">6.</span> <span class="toc-text">总结</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99"><span class="toc-number">7.</span> <span class="toc-text">参考资料</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E4%BD%9C%E8%80%85%E7%9A%84%E8%AF%9D"><span class="toc-number">8.</span> <span class="toc-text">作者的话</span></a></li></ol></div></div></div></div></main><footer id="footer" style="background-image: url('/img/cover19.png')"><div id="footer-wrap"><div class="copyright">&copy;2023 - 2025 By 夜悊</div><div class="footer_custom_text"><a target="_blank" href="https://beian.miit.gov.cn/" >琼ICP备2023001225号-1</a><br><img src= "" data-lazy-src="/img/beian.png"/>&nbsp<a target="_blank" href="https://www.beian.gov.cn/portal/registerSystemInfo?recordcode=46010802001221" >琼公网安备 46010802001221号</a></div></div></footer></div><div id="rightside"><div id="rightside-config-hide"><button id="translateLink" type="button" title="简繁转换">繁</button><button id="readmode" type="button" title="阅读模式"><i class="fas fa-book-open"></i></button></div><div id="rightside-config-show"><button id="rightside-config" type="button" title="设置"><i class="fas fa-cog fa-spin"></i></button><button id="hide-aside-btn" 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